結果
問題 | No.1900 Don't be Powers of 2 |
ユーザー | tamato |
提出日時 | 2022-04-08 22:45:27 |
言語 | PyPy3 (7.3.15) |
結果 |
AC
|
実行時間 | 1,577 ms / 2,000 ms |
コード長 | 3,176 bytes |
コンパイル時間 | 273 ms |
コンパイル使用メモリ | 82,168 KB |
実行使用メモリ | 323,216 KB |
最終ジャッジ日時 | 2024-11-28 13:35:59 |
合計ジャッジ時間 | 16,470 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 42 |
ソースコード
mod = 998244353 def main(): import sys input = sys.stdin.readline from collections import deque class Dinic: def __init__(self, N): self.N = N self.adj = [[] for _ in range(N + 1)] self.lv = None self.progress = None self.inf = 1 << 60 def add_edge(self, fr, to, cap): # [to, cap, rev] forward = [to, cap, None] backward = forward[2] = [fr, 0, forward] self.adj[fr].append(forward) self.adj[to].append(backward) def bfs(self, s, t): que = deque([s]) lv = [-1] * (self.N + 1) lv[s] = 0 while que: v = que.popleft() lvv = lv[v] for u, cap, _ in self.adj[v]: if cap and lv[u] == -1: que.append(u) lv[u] = lvv + 1 if u == t: break self.lv = lv def dfs(self, s, t, flow): st = deque([s]) st_f = deque([flow]) while st: v = st[-1] f = st_f[-1] if v == t: for i in range(len(st) - 1, 0, -1): p = st[i - 1] edge = self.adj[p][self.progress[p] - 1] edge[1] -= f edge[2][1] += f return f if self.progress[v] == len(self.adj[v]): st.pop() st_f.pop() continue else: adj_v = self.adj[v] for i in range(self.progress[v], len(adj_v)): i = self.progress[v] self.progress[v] = i + 1 u, cap, rev = adj_v[i] if not cap or self.lv[u] != self.lv[v] + 1: continue else: st.append(u) st_f.append(min(st_f[-1], cap)) break def max_flow(self, s, t): flow = 0 while True: self.bfs(s, t) if self.lv[t] < 0: return flow self.progress = [0] * (self.N + 1) flow_new = self.dfs(s, t, self.inf) while flow_new: flow += flow_new flow_new = self.dfs(s, t, self.inf) def popcount(n): res = 0 for i in range(30): res += n >> i & 1 return res N = int(input()) A = list(map(int, input().split())) D = Dinic(N + 2) s = N + 1 t = s + 1 for i, a in enumerate(A): k = popcount(a) if k & 1: D.add_edge(i + 1, t, 1) else: D.add_edge(s, i + 1, 1) for j, b in enumerate(A): if popcount(a ^ b) == 1: D.add_edge(i + 1, j + 1, 1) print(N - D.max_flow(s, t)) if __name__ == '__main__': main()